Very interesting demo! I love the variety of the voices and your range of emotion is beautifully varied. Like Steve mentioned, the gains and general volume controls are something to look out for but aside from that you're definitely a quality artist. Love the accent at the end!
If you're fairly new to the voice acting scene, then I'd say that is a very nice start! There's definitely a good use of variety of emotions and characters here in the 1:26 time span. It was funny, intense, and amusing which are all good traits to use for character demo.
A tip that I would suggest: careful to watch your gain levels for both your voice and the mixed in sfx. Your voice seemed to be peaking a little too high which then caused a bit of distortion. This is definitely something that can be an easy fix. Overall, I liked it and I think you've got a great handle so far! Keep it up!
Please contact me if you would like to use this in a project. We can discuss the details.
* Contains third-party samples.
Excercise caution when using it, refer to author comments / contact the author for details.